[Insight-users] Level Set Deformable Registration Vector Components and Their Units

[Luis Ibanez]

Hi Kevin,

The units will be the same as the ones used for the pixel spacing
in the input images.

If your images were using spacing in millimeters, then the units
of the deformation field computed by the deformable registration
will also be in millimeters.

If your images were using spacing in microns, then the units
of the deformation field computed by the deformable registration
will also be in microns.


   Regards,


      Luis


-----------------
Kevin Ming wrote:
> Hi,
> 
> This is probably very trivial, but in what units are the vector 
> components in after you've performed a level set deformable 
> registration?  Would they be in mm, for example, if the input images are 
> in mm, or would they simply be relative magnitudes?
> 
> For example:  Assuming I performed a LS deformable registration on 2 3D 
> images with spacing = {0.2 0.2 0.4} mm, origin {0 0 0}, and size = {85 
> 85 64} pixels, and one of the images is shifted in the y direction by 
> one pixel.  What would, say, a deformation = { 0.078829 0.249666 0} 
> indicate?
> 
> 
> Thank you,
> Kevin
> 
> 
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